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olya-2409 [2.1K]
2 years ago
7

Plz help solve this please and thx u​

Mathematics
1 answer:
kow [346]2 years ago
3 0
2 (an - 1) = 40
2an - 2 =40
2an = 40 - 2
2an = 38
2an/2 = 38/2
an = 19
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